COLOR PATTERN FILM FOR METAL SHELL
A color pattern film for metal shell is provided. The color pattern film for metal shell includes a transparent polymer substrate, a releasing coating layer, a protective layer, an ink layer, and an adhesive layer. The releasing coating layer is on the transparent polymer substrate, the protective layer is on the releasing coating layer, the ink layer is on the protective layer, and the adhesive layer is on the ink layer. The adhesive layer at least includes a base resin which is one of resin systems selected from ethylene-vinyl acetate (EVA), polyester (PET) resin, and polyolefin resin. The color pattern film for metal shell can be directly pressed and attached onto a metal sheet or coil, and subsequently punched, thus the problems of the prior art that the yield of adhesive wet film coating process is not easily controlled and complex post-processes are still required after molding are addressed.
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This application claims the priority benefit of Chinese application serial no. 200710182316.7, filed on Oct. 17, 2007. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.
BACKGROUND OF THE INVENTION1. Field of the Invention
The present invention generally relates to a technique of shaping the appearance of a metal shell, in particular, to a color pattern film for metal shell.
2. Description of Related Art
Three types of the methods of shaping the appearance of a metal shell exist.
The first method is a spraying painting technology to molded metal shell, which includes the following steps, as shown in
The second method is a heat transfer technology to molded metal shell, as shown in
Firstly, referring to
Finally, referring to
The third method is film lamination technology for metal sheet material or coil material, as shown in
Main function of the polymer film is to protect the metal surface or provide artificial sense of other materials (for example, wood grain), so it is necessary to perform a baking process and an adhesive curing process to ensure the close attachment of the polymer film and the metal. Therefore, it is further necessary to tightly control the processes and the stability of the adhesive, thus the manufacturing cost is increased. In addition, the adhesive 304 used in the third method contains a great number of solvents and does not satisfy current requirements on environmental protection.
All the above conventional arts respectively have the disadvantages that the process yield is poor, and the appearance design, pattern positioning accuracy, and processes are too complex.
SUMMARY OF THE INVENTIONAccordingly, the present invention is directed to a color pattern film for metal shell, which can be manufactured without the adhesive wet film coating process in the conventional art, so the yield is easily controlled, the current requirements on environmental protection are met, and the protection of high hardness, abrasion resistance, and chemicals resistance are provided.
In order to realize the above objective, the color pattern film for metal-shell of the present invention includes:
- a transparent polymer substrate;
- a releasing coating layer, located on the transparent polymer substrate;
- a protective layer, located on the releasing coating layer;
- an ink layer, located on the protective layer; and
- an adhesive layer, located on the ink layer, at least including a base resin, which is one of resin systems selected from ethylene-vinyl acetate (EVA), polyester (PET) resin, and polyolefin resin.
In the color pattern film for metal shell, the adhesive layer further includes a tackifier, a plasticizer, an antioxidant, and a wax.
In the color pattern film for metal shell, the solid content of the adhesive layer is between 90 and 100 wt %.
In the color pattern film for metal shell, the adhesive layer further includes a thermosetting resin.
In the color pattern film for metal shell, the thermosetting resin is one selected from a resin system consisting of acrylic resin and urethane resin or composites thereof.
In the color pattern film for metal shell, the melting temperature of the adhesive layer is lower than 200° C.
In the color pattern film for metal shell, the glass transition temperature of the adhesive layer is higher than 60° C.
In the color pattern film for metal shell, the content of the base resin in the adhesive layer is between 20 and 80%.
In the color pattern film for metal shell, the adhesive layer is free of solvents.
In the color pattern film for metal shell, the thickness of the adhesive layer is 10-100 μm.
In the color pattern film for metal shell, the transparent polymer substrate is made of a material without polyvinyl chloride resin.
In the color pattern film for metal shell, the thickness of the transparent polymer substrate is 20-200 μm.
In the color pattern film for metal shell, the material of the transparent polymer substrate includes acrylic resin, PET resin, polystyrene (PS) resin, polypropylene (PP) resin, polyethylene (PE) resin, polycarbonate (PC) resin, or polyurethane (PU) resin.
In the color pattern film for metal shell, the material of the protective layer is one resin selected from a resin system consisting of acrylic resin, PU resin, epoxy resin, and PET resin.
In the color pattern film for metal shell, the protective layer is composed of thermosetting resin and UV curing resin.
In the color pattern film for metal shell, the protective layer further includes a curing agent for the thermosetting resin and a photoinitiator for the UV curing system.
The color pattern film for metal shell of the present invention can be directly pressed and attached onto a metal sheet material or a coil material to form a color grain metal plate material or coil material, which can be subsequently punched and subjected to other processing, so the problems of the conventional art that the yield of adhesive wet film coating process is not easily controlled and complex post-processes are still required after molding are addressed.
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
Reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.
Referring to
Referring to
Referring to
The protective layer 406 in this embodiment can be composed of a thermosetting resin and a UV curing resin, in which a curing agent for the thermosetting resin and a photoinitiator for the UV curing system are added. Therefore, firstly, the thermosetting resin and the curing agent in the protective layer 406 firstly react with each other by performing a lamination process with the metal sheet material or coil material 500 to form a half-cured state and be transparent. The half-cured protective layer 406 is beneficial to the subsequent process of shaping the appearance, for example, punching, such that the molded protective layer 406 is prevented from being cracked or damaged because of an excessively high hardness and action forces during processing.
Next, referring to
Next, referring to
In view of the above, the diversified and customized color pattern film for metal shell prepared from the transparent polymer substrate, the ink layer, and the adhesive layer according to the present invention, can be directly pressed and attached onto a metal sheet material or coil material to form a color grain metal plate material or coil material, which can be subsequent punched and subjected to other processing, so the problems of the conventional art that the yield of adhesive wet film coating process is not easily controlled and complex post-processes are still required after molding are addressed, and the present invention has advantages of quick and successive production of the metal shell. Further, the appearance of the color pattern film for metal shell of the present invention is diversified, and the appearance patterns and words can be positioned.
It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.
Claims
1. A color pattern film for metal shell, comprising:
- a transparent polymer substrate;
- a releasing coating layer, located on the transparent polymer substrate;
- a protective layer, located on the releasing coating layer;
- an ink layer, located on the protective layer; and
- an adhesive layer, located on the ink layer, wherein the adhesive layer at least comprises a base resin which is one of resin systems selected from ethylene-vinyl acetate (EVA), polyester (PET) resin, and polyolefin resin.
2. The color pattern film for metal shell according to claim 1, wherein the adhesive layer further comprises a tackifier, a plasticizer, an antioxidant, and a wax.
3. The color pattern film for metal shell according to claim 1, wherein a solid content of the adhesive layer is between 90 and 100 wt %.
4. The color pattern film for metal shell according to claim 1, wherein the adhesive layer further comprises a thermosetting resin.
5. The color pattern film for metal shell according to claim 4, wherein the thermosetting resin is one selected from a resin system consisting of acrylic resin and urethane resin or composites thereof.
6. The color pattern film for metal shell according to claim 1, wherein a melting temperature of the adhesive layer is lower than 200° C.
7. The color pattern film for metal shell according to claim 1, wherein a glass transition temperature of the adhesive layer is higher than 60° C.
8. The color pattern film for metal shell according to claim 1, wherein a content of the base resin in the adhesive layer is between 20 and 80%.
9. The color pattern film for metal shell according to claim 1, wherein the adhesive layer is free of solvents.
10. The color pattern film for metal shell according to claim 1, wherein a thickness of the adhesive layer is 10-100 μm.
11. The color pattern film for metal shell according to claim 1, wherein the transparent polymer substrate is made of a material without polyvinyl chloride resin.
12. The color pattern film for metal shell according to claim 1, wherein a thickness of the transparent polymer substrate is 20-200 μm.
13. The color pattern film for metal shell according to claim 1, wherein a material of the transparent polymer substrate comprises acrylic resin, PET resin, polystyrene (PS) resin, polypropylene (PP) resin, polyethylene (PE) resin, polycarbonate (PC) resin, or polyurethane (PU) resin.
14. The color pattern film for metal shell according to claim 1, wherein a material of the protective layer is one resin selected from a resin system consisting of acrylic resin, PU resin, epoxy resin, and PET resin.
15. The color pattern film for metal shell according to claim 1, wherein the protective layer is composed of a thermosetting resin and a UV curing resin.
16. The color pattern film for metal shell according to claim 15, wherein the protective layer further comprises a curing agent for the thermosetting resin and a photoinitiator for the UV curing system.
Type: Application
Filed: Feb 4, 2008
Publication Date: Apr 23, 2009
Applicant: COMPAL ELECTRONICS, INC. (Taipei City)
Inventors: Chien-Chun Wu (Taipei City), Chen-Hua Liu (Taipei City), Bar-Long Denq (Taipei City), Yu-Ju Chen (Taipei City), Ru-Jen Chiu (Taipei City)
Application Number: 12/025,059
International Classification: B32B 33/00 (20060101);